So you can tap into the skills of people that have worked for magnitudes more money for gigs for big corporations to make commercials or to go live on air on radio shows. Of course there are many jokers in the mix too that you have to sift through.

For audio you get an MP3 file to download, and for video it is likely to be produced on a MAC in .mov format. But there are plenty of audio and video editing softwares that you can make use of to convert these files to your needs.